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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64e3b16ef14cef345fdf0579a6e301e99a65a8e91112ce8e9989d43e3c79fb59' 
  AND token = 'xxF/dqaz2N3GVAt2TjRCOOuU0bQP9yYijfyFUJLdDno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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