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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f785ebcad8d16799cdf3a71d2edcb04b9e39c020c0e8b4b0ffd608727e77aaa9' 
  AND token = 'oRGQL66+UGuk6QF4juT+UFgrmRiku0O4drFVB51EklQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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