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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a07247ca805d4b7157b7529183b56a6a47cbd652d9ff62ec20ced401c5ed418' 
  AND token = 'o9moWKANNJG7XN0/RV1/Td9CtgIu5CzCrZDR6oSa81k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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