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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '260a3f0559dd84b9b0ed83bc2acb8a0ab8bf0eaf793a9a8f87b259a893e7107d' 
  AND token = 'kcbb1OgDIUcPyKBW/OUt5PDpMfhmnAN8Croqz+tc2ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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