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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6014eb37513a799125105c6e3093b6a8d4bfcd0ea99b1bad44b814ec4bd1f4a6' 
  AND token = 'PPywTLsUa3lC5/r8eWc1xw7np8DtIfiKAq0xNjmrBII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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