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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b45c478de308bf74cc75466217e8debdfcffff5f7300954a14180cb258a717a' 
  AND token = '8NjYQrnYHkjVq62b9i9w06+wcqC7Up60bAlaTFZM7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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