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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dc06831936a3882856a3b597ce2d91243dc4b621aaa5688afa8798e4e098208' 
  AND token = 'vTBzE4KxRpA/f1NzF3ku8fRKsSjbF5kYwzjRNRQkA+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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