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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcaefae4e8d283711d28014972fbee08cf1e235725a05e599d500c3d9cec9e38' 
  AND token = 'pD7kLIedd2xZIE794ZiM/RHBykjmhLBLfACquFd960c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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