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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '634e78e73bdb6086bdfac4a46c31bb633bb0f44b8d58e1d626efdf56842cff8c' 
  AND token = '43Z8yXFHl+iYKZKrTt4SRcw2K7dXYbXVh+gBmt+KYPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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