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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '504077e786951a18b319775407f9f0bd9a05acaeb7ba6926f51b080fbb125adb' 
  AND token = 'JmJBiDA6NMSs3Th/fy6gjwuSmlMUEeLa90pvNXsYJ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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