SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ac75a7f2f3b984d3191913668f49d88e0b11ab7d86211e19f7a050b2b8501a' 
  AND token = 'jJYGq6yL1uvgbu5HRXhldX1wLcjtqL/TyZbKcXvRJoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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