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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64c870fdbc7cd9ce83c8fa1f3b6cc907afd823afa5b1b5a816c6ce669a4a45be' 
  AND token = 'ZAedbY2/5aH9MCjopk2Ae6FvwGhjPPiel3+5SwIxw20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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