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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6b57cbf0571762436a2ca7c4c8b403c0c597c1417e3b52a063560b06eb66e1a' 
  AND token = 'WZWOywyAy3gSup0zjozxdSvhBy66ifeB1nD4hYo/jVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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