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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12550f2509a0075fd94195d5822b4c76576990a9b404a7d633de7535820bf59d' 
  AND token = '+IROpbA/+Lmb4yfY9AdoovazQpo111JOLSIpaSss7xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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