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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805d51a17cbdd2fe7a1280419398d27ddd7b2a94c623d3c00b8ddfaf4e8ae624' 
  AND token = 'YQImSD2xTooaEZRplizjNvfoOJswy1W0Ka0cg2wJ3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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