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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e6873052467108b3274d065c89d7d89432b7cc37e6fafce0a4cdb9ebece71c' 
  AND token = '78zIvtveSJ4qVMSwIX7Up1Z07zsXhBJEh7bLKvdnqkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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