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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '636c9a56446e9c35dbfddec68519749908b3ecb245b82a519bfc6697b57cfa15' 
  AND token = 'Pcc6nJIActeALrCrKhZNyZwho/7No3OJeCkznX4kL6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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