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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1755cfced275380d9b876929b2d6245ac6d6cb7c6f0b1467b867144ad760a7af' 
  AND token = 'ApUi31Kkxp2O4K+JUhlshQ7TNldxcbVOiOM17fm5C6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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