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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '049b1b510e15ad96f4350fb3a83ce5e7edc6c3b762cf32b9a4f6c25dd7c5c9f2' 
  AND token = 'kc6nCXzCi0GNn+QZzlOvfo1knChppZ7HE3m3Fv+Uk9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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