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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e96be5a957c16fb0e014b495a2defc302d024ca6b23b795dd94b15475a63ed2' 
  AND token = '9xYNjibFYJRC4az1ryf/s+nh0TUQn1Mc0bswp0g1ONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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