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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1569279e9d07549c0f381761024c7746fcb2ea2f8037d6b08b15d8a312e3e898' 
  AND token = 'mjf/XI7HV1ffOovrcNRmTRrVMeUSEfoo9iJ5e9gR760=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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