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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a875b5e4bab4a908ae064bac66982065fa6b92d83b10599f2acba69e2cdc95e7' 
  AND token = 'EcJcM1ZGS5pGp6/neNsknn9A7Zp6RN1F4w8aXwifRto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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