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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6beb1193c312cab6e964d8690bad6319a49e7ba748167aab60dc2325083b890a' 
  AND token = 'rW2tpnzVv+B2Krp87ofD4ZKet+qkRrF3ucoEnQNBsEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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