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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '314751b55d9a229d9e8a7329140d785784b81b4193afb8a60237aeebfbb4db1f' 
  AND token = '7F25jpsQINL/k2I6oU/JCajaFZj4rOJIBUbCan5XWOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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