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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcfe69bbcb68181cd63a0cd699270632c898bd915c36f8a3c584ce587aeb1bed' 
  AND token = 'dkfnse9+NHK1XqXopvDCevwGsc3Rnb/nNaaJ3Q9JFro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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