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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f567856852f8ec23dba61314d7592e00310e55bc0ff89b7a9a436e81ca12819' 
  AND token = 'z9VAxI6MBKuLdic2NdNnn4PtLQ2XpKS1AVrOgAIyMzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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