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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34529a2d0e96a8cf4ae3da87ac779db9b5ee2248404445e3b1826bc74e3c9ef8' 
  AND token = '16tOFoY6luHTcg+n1GRb01Dkn2IDZTkVlH4ZckBCFeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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