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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '039da43a75c4c3bfc5cdd4d7f1642af75771b2f96cf416a93bb533b822ebfa7c' 
  AND token = '2dLfiZcq6FyX5faqSUq7XywkN0sT0NsQq5N7tylB65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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