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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12c7bf2be9e17c06ec36a6bced8fa8b0e780662123897a73df096ba6b70db5cc' 
  AND token = '5SuXKLVB7G0/rjmpe0Qr68SnKhF5/I8hlgpddt3EvWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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