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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1687dd273bc9afc96a089077eddfbed173ec147153c42e1fe566c7b186c56964' 
  AND token = '9z9/yDsbT4khZ4yb0FVS0H0Mkht26TnAIhhnJhFUfNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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