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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc906bc386f13d6904bcdc74c440e007b155ef3723b0f9de6674195ee816e51c' 
  AND token = 'lx2QT/TZ6xvTF1LWhPXfQZTmIVWdC31JapXmz9F/WJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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