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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f456acdd2854cd74e66a299f4b5f0484de00d83d6d9d19b588df25dc8dae5fce' 
  AND token = 'CvxtzfSRr1jPKcEmvYkdH3YCYyJVJaS3GD/2pNz6RDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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