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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97f396ff287e11850e9d2ad23724d6a528a0a312b9232910e7e95702c6240fe4' 
  AND token = '5XH+AwIQFAP5VeyCx7cfdY/Hhf7D0ff2Q5oj8BxjLYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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