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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ba51669842ef759fd80a63e034b47dafbdadf2802757f9c107b56dd5d0f0328' 
  AND token = '/+R0tSqdpWJn6X1ndWYcds66q/oHsoNr6RyU7xye+o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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