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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27b4cb08609d47ec3c31a8b923229c60fc16d2729a929ca9f88ef9fc9907f1f8' 
  AND token = '9n8Hhxd+2NlRPfQQJKCXfe28pwnJ97mxfCLPwMOQBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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