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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '900c9828c129482b102f3a9cc9801d943eb9b8b88ce2e120db5c8b6d434c6b18' 
  AND token = 'Io+QvL1PcO6S+Vf+gLpx7ZE9Y49yqXj7m8uuEH5500k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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