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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38ae07533814d7f49b6fd2af1d03f77f5a932cb567bc1106a914bb810abcf603' 
  AND token = 'hQOZFD/m/E02cCJyRzVZzIN188ay/NzGeEnq11Sr5pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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