SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd900f0228284768166071ec62243f450d22abf830f82c7f840552788222999a2' 
  AND token = 'hHJfS+uKPzkyW3A3pJp3ecjzXtoqXGm/krTfbZtZzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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