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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f4c8f015ff2af59f7c5533c5f9bdbc8b59518b6f45b1d3d088d77b872a18f1' 
  AND token = '9aiVfqYb7UGgA+srivvqpk9tYSP49YOa9iaByilcNMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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