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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e51ac662c34da52d1e507cf0c4f83491583c39a6e33f4b8847b0f8664422728' 
  AND token = 'gp9w+al5s3lMnRcpvaukvY4K9W3dPtV85orE0yPbE5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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