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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b289b5b8b2c4e19cf3de9205c16a6c2b36349650821ceb0b2c49c67b75c9ca' 
  AND token = 'ZUFYP9ofJv9mNoLuPdpN4iAdG4uW/+k9xaImxwLe1JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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