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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c2a34e18cd6153df46d256fa6b5ce9a08db96854348d809d6a293e6fd3622d4' 
  AND token = '5FMCxLSDxEHHTdFJE0WQDm8VnP+8/zeEhvDg0gxDwFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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