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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b70295b9185e69d9d9e237e49472e4692574609550e9e4c35598858c33de7f8' 
  AND token = '3wKF4bdyjNbFAgDNYV5mv/UvCOrSrydtOXWaxTyGwOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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