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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '631f0a768c87a77fe0c64ad8b88536eca0c9983e79f526bd1b5fb9493090da31' 
  AND token = '+a17cgXCSq3N/CfBtdr/ae9yZlm/29Mp8L6DrAe4SEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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