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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a28ae80ceb071130ba069e2d2fd5b33b178054e4de9c0710e098437ec023ac49' 
  AND token = 'JEff/4mesqtKTJ0n4WSSLW6+/KgUXSq5SKgD/aPoyec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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