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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '098d1e73e67f92d092e5025b1750cd661dcb3dd58928d0b29db78a3ed76a46c1' 
  AND token = 'v6BVSk+YwIYB10cnAmhnstvfE9Wt2aDgUgZ88bnn7cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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