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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6356bce3d15629b860ebcf0a3a0ed9c982a9a9f9cfa923467494985057fd4c72' 
  AND token = 'A0jpwCeGt5fNCCX7OHL/JrCsf/2bjI6IGDRcvkbvzLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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