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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc9badb3f26284090536a252d9948461ce9a54346cf14ff353582be0c0d51709' 
  AND token = 'niiUZ/1px759OOmK5ZXw9n1zl27hhpSXQeUu+5/y8iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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