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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba521393d84241504c532c5523c483d7f36a5ef7b1ca752adaef9f7fef41d3f1' 
  AND token = '2lg44QfEWBJqVm3jiz6Jmo5meTytFoUbPpbXP5+nUkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}