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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bc7e73f49445b220a9e23521bd1f66a7145d456754af1f55306278e936d788c' 
  AND token = 'd/C5ba5qOxjB7oHzb+UabGeiVcZ9qRrL+ups589eubM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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