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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90659e9f46602efb1e0ab7f571f9854fd6d67b4b080624193cf19b5391b9a4a8' 
  AND token = 'uKkBpc9B1UNMPW4/sr8W6SNQhxpTyI+mRr7he8aBsl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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