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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7507022f4d90f5ea57685d8a88010ddc9f149b9b8891efef32b6232b19af39f' 
  AND token = '0n7kvWcxNafm61Ebvuz6kg5RpMmFNY480I1NgTZPPYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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