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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e0e328ce06e6e4fa2a00b2c21c2950118eb003164afcc3d91f43349919cf9d' 
  AND token = 'Hd1THlM2rollUB/ZoG87suRbCG06XHh8NEHXsIqpbgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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