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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7daa3309de7c3512822e2e65641ede30e03c805b59a0ca196ff5525f9e2ca25' 
  AND token = 'HuAsmsOCa38G2dZubSnMXA5n22i2cm1qQc8X3/guyoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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