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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752e3db65d69f77e1a76b8c21e68c609551e2d23bd038cb2be6bf531ef8638f9' 
  AND token = 'GQ0SyjMGMSQhacqM81uWWPAE0NzkwMOS5kp550jSN50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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