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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '630ac85c6666ddd6a13cab1c49ee4f6d9e3b482a450af7073ace4cdf8c7dbe13' 
  AND token = 'UZHRVsyYgXqcq31Z2iZ3gOAPCMKJ1kgpFJfUucz1rkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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